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st: RE: RE: RE: repeating the same analysis for each stratum


From   "Ngo,PT (pgr)" <P.T.Ngo@lse.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: repeating the same analysis for each stratum
Date   Tue, 29 Jul 2003 14:22:24 +0100

Could I please clarify with you what you mean by a problem with the s.e. ? 

If the PSU _within each stratum_ are selected with probability proportional to the size of the population, so that the distribution of sampled households matches the distribution of the population across the stratum, and the household units within each PSU are selected with equal probability, would each stratum sample not be a self-weighted sample ?

Thanks in advance,

TM

-----Original Message-----
From: AMIDON, CARRIE [mailto:camidon@ersgroup.com]
Sent: 29 July 2003 13:39
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: RE: repeating the same analysis for each stratum


That would potentially cause a problem with your standard errors since
you are trying to examine a subset. Read the portion of the svy commands
in the manual that deals with subsets of samples in analysis.

C. Amidon

-----Original Message-----
From: Ngo,PT (pgr) [mailto:P.T.Ngo@lse.ac.uk] 
Sent: Tuesday, July 29, 2003 7:38 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: repeating the same analysis for each stratum


Hello Phung,

Would this work ? keep only the data for each stratum, and call your do
file. svyset, clear allows to clear the survey variable which I suppose
you have specified in your main analysis.do file.

forvalues k = 1 (1) 26 {
	drop if strata~=`k'
	svyset, clear
	do analysis.do
	}

Thi Minh Ngo

-----Original Message-----
From: Phung Lang [mailto:plang@ifspm.unizh.ch]
Sent: 29 July 2003 12:44
To: statalist@hsphsun2.harvard.edu
Subject: st: repeating the same analysis for each stratum


Dear Statalist

I have a database for a complex survey with 26 strata and 100 PSUs. I
have done the analysis using the svy components for the entire database,
and now would like to repeat the same analysis for each of the 26
strata. The planned analysis is already a do.file. I have not been able
to figure out how run this do.file for each stratum efficiently as I am
not a programmer. I have tried "by", but it does not work with the
svymean or do command. Can someone give me some advice?  I am using
stata 7.0.

Gratefully yours,
Phung


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